Pressure Operated Electric Air Control/Electric Air Switching Valve (PEDES)

The Pressure Operated Electric Air Control/Electric Air Switching Valve (PEDES) combines both diverter function and air switching function into one integral component.

The PEDES valve is electrically controlled by the ECM and operated by air pump pressure. The valve's operation is not dependent on intake manifold vacuum.

For cold engine (open loop) operation, the port solenoid is energized and air flows to exhaust ports. In warm engine (closed loop) operation, the port solenoid is de-energized and converter solenoid is energized. This forces airflow to the converter. In the divert mode, both solenoids are de-energized and airflow is allowed to vent to atmosphere.